From my MP3 collection. I buy the songs or albums she likes and broadcast them. For some that are not on sale anywhere, I scrape them off youtube, but usually send a note to that channel for original sources where I can pay for it.
Cool! I asked because there are many niche playlists on Spotify you can find for oldies, for example some very specific for the 60s, 50s, 40s, etc. Perhaps it could help her discover similar, but new, music.